Interrupter for ignition devices



A ril 22, 1941. K. STRAUB arm. 2,239,124

INTERRUPTER FOR IGNITION DEVICES Filed NOV. 4, 1938 assembly is present.

Patented Apr. 22, 1941 2,239,124 v I mrarmurrm FOR IGNITION navreas Karl Straub and Adolf Ellwanger, Stuttgart, Germany,

assignors to Robert Bosch Gesellscbaft mit beschrankter Haftung, Stuttgart, Germany Application November 4, 1938, Serial No. 238,846 In Germany November 29, 1937 5 Claims.

with a pivotally mounted contact lever for ignition devices of internal-combustion engines and has for its object a constructional formation which enables the interrupter to operate in a satisfactory manner and particularly at high speeds.

According to the'presnt invention, the interrupter spring causing the contact pressure, the

cam follower and the movable interrupter contact are secured to the interrupter rocking arm at the same point, so that the resilient and defleeting force act directly on the contact. Thus, without a substantial stressing or bending of the rocking arm, the contact pressure can be so increased that the after vibration or'chattering of the interrupter contacts which. frequently occur at high speeds is avoided. The

(Cl. 200-30) The present invention relates to interrupters after-vibration or chattering is known to be due to the resilient impact on impinging on the fixed interrupter contact, whereby the movable interrupter contact tends to lift itself again from the interrupter plate b. A bush d of insulating material serves for'insulating the lever a from the pin 0. To the end of the rocking arm a remote from the bush d and at the same point thereon are secured the movable interrupter contact e, the cam follower g engaging the cam f, and the interrupter spring i causing the contact pressure between the movable interrupter contact e and 'sented the possibility of a considerable increase of contact pressure without the lever 41 being thereby endangered as a result of excessive stressing.

We declare, that what we claim is: V

1. In an interrupter, the combination of a stationary contact, a rocking arm, a movable contact for cooperating with said stationary contact, said movable, contact being directly and rigidly mounted upon said rocking arm, a rotary cam, a cam follower for cooperating with said cam and operating said rocking arm, a biasing spring secured to said rocking arm for urging said movable contact towards said fixed contact,

and common means for securing the .movable contact, the biasing spring and the cam follower to said rocking arm'with the contact in alinement with said securing means and said cam follower and biasing spring being secured to said rocking arm at the point of attachment of said movable contact to said rocking arm, whereby the force of said spring and the 'force of said follower act directly upon said movable contact and whereby the rocking arm is not inflected by the resilient force of said spring.

2. An interrupter according to claim- 1, in which a single rivet is provided to secure the movable contact, the biasing spring and the cam follower to the rocking arm. v v

3. An interrupter as set out in claim 1, in

I which the movable and stationary contacts and the fixed interrupter contact '71. For securing the spring 1, the contact e and the cam follower to the rocking arm there is used in the arrangement described a rivet k, whilst for setting the spacings of the contacts, the fixed contact h is mounted on a carrying plate I, which is rockable about the bolt 0, and is'provided with a slot 1n so that it can be adjustably fixed in any one of a number of positions by means of the setting screw n adapted for screw threaded engagement with the interrupter plate b.

In the modified form of construction shown in Figure 2, substantially the same form of In this modification the cam follower g is merely rotated through 180 relative to the form of construction shown in Figure 1. In both cases, however, there is presaid camfollower are arranged at the same side of said rocking arm. a 3

4. In an interrupter, the combination of a main plate member, a rocking arm pivoted to said plate member and carrying a movable contact rigidly and directly mounted upon said rocking arm, an auxiliary plate member pivotally secured tosaid main plate member on the pivotal urging said movable contact towards said fixed contact, and common means for securing the movable contact, the biasing spring and the cam follower to said rocking arm with the contact in alinement with said securing means and said cam follower and biasing spring being secured to said rocking arm at the point of attachment of said movable contact to said rocking arm, whereby the force of said spring and the force of said follower act directly upon said movable contact and whereby the rocking arm is not inflected by the resilient force of said spring.

5. In an interrupt-er, the combination of a main plate member, a rocking arm pivoted to said plate member and carrying a movable contact rigidly and directly mounted upon said rocking arm, an auxiliary plate member pivotally secured to said main plate member on the pivotal axis of said rocking arm and carrying a stationary contact cooperating with said movable contact, means for adjustably securing said auxiliary plate member to said main plate member,

a rotary cam, a cam follower for cooperating with said cam and operating said rocking arm, a biasing spring for urging said movable contact towards said fixed contact, and a single rivet for securing said movable contact, said cam follower and said spring at the same point to said rocking arm, with said contact and rivet in alinement,.

whereby the force of said spring and the force of said follower act directly upon said movable contact and whereby the rocking arm is not inflected by the resilient force of said spring.

' KARL STRAUB.

ADOLF ELLWANGER. 

